重庆地区杂填土深基坑支护技术应用研究

On the Application of the Supporting Technique to the Construction of Deep Foundation Pits of Miscellaneous Fill in the Chongqing Region

重庆地处丘陵山区,在城市建设过程中伴随着对原始地形地貌的改造形成了许多杂填土回填区。介绍了重庆地区杂填土工程特性、杂填土基坑破坏模式以及岩土压力计算方法。结合相关工程实践,主要研究了重庆地区杂填土深基坑中土钉墙、排桩锚杆挡墙以及悬臂桩支挡结构应用现状和适用条件以及设计计算方法,并着重介绍和分析了各种支护结构在应用过程中应注意的问题。同时介绍了重庆杂填土基坑地下水处理情况。最后根据工作中的体会,对重庆杂填土深基坑应用和研究工作提出一些问题与建议。

As Chongqing is located in a hilly mountainous region, there are quite a few districts of miscellaneous fill formed with the transformation of its original topographical features in the process of the urban construction. Introduced first in the paper are the engineering properties of the miscellaneous fill in Chongqing, the failure modes of the foundation pit of the miscellaneous fill,and the methods of calculating the rock and soil pressure. With some corresponding practical projects as illustrating exam- ples,a study is then made of the application of and the application conditions for soil nailing walls, soldier-pile-anchor-rod retai- ning walls and cantilever pile retaining structures to deep foundation pits in Chongqing,and the corresponding design and calcu- lation methods, with greater stress placed on the introduction to and the analysis of the problems worth our great attention in the course of applying the various supporting structures. Meanwhile,the treatment of underground water for the deep foundation pits of miscellaneous fill in Chongqing is also introduced in the paper. Finally,in the light of the working experience and reflection,put forward in the paper are some problems and suggestions related to the further application of and research into the deep foundation pits of miscellaneous fill in Chongqing in the future.